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Chapter 8

Rock Record Vocab

QuestionAnswer
Describe James Hutton’s principle of uniformitarianism. the principle that geologic processes that occurred in the past are similar to the processes that occur today
Compare relative age and absolute age. Relative age is the age of an object in relation to other objects and absolute age is the numeric age of an object
Describe the law of superposition. upper sedimentary rock layers are younger than the rock layers below them
If an igneous intrusion is observed crossing through a layer of older sedimentary rock, what geological law applies? law of crosscutting relationships
When using radiometric dating to determine the absolute age of rocks, what do scientists compare? parent isotopes are compared to daughter isotopes
Radioactive decay is used to determine the absolute age of rocks because it happens at what rate? at a relatively constant rate
What is an index fossil? a fossil used to date rock layers
How old is the earth estimated to be? 4.6 or 4.8 billion years old
Layers of rock are called strata
What does relative age indicate? that one rock layer is older than another layer
A fault or body of rock is younger than any other body of rock it cuts through according to the law of cross cutting relationships
Created by: Amatulli Science
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